I just installed Reader 9, and now when I click on a link to a PDF on a web page I get this message: "The Adobe Acrobat/Reader that is running cannot be used to view PDF files in a web browser. Adobe Acrobat/Reader version 8 or 9 is required. Please exit and try again." Since I AM running version 9, this seems peculiar. Any ideas?

Actually, the PDF I was trying to open is from my own website, and it opened fine before I installed Reader 9. Now I think I'd like to find an older version to reinstall and see if that works. I can't get version 9 to work on my XP or my Vista computer.

Interesting. So we have to assume this message isn't from the web
site.

Three questions
1. Do you have more than one version of Adobe Reader installed on this
computer?
2. What happens if you start Adobe Reader first, from the START menu,
and LEAVE IT RUNNING when trying to view the file?
3. Do PDF files on other sites work OK, or not?

No to all three questions. I'm wondering if it has something to do with the fact that I have Adobe CS3 (including Acrobat) installed on both these computers, but can have only one activated at a time. I started having trouble with Reader 8 when I had CS3 de-activated on the XP computer, but the trouble continued when I reactivated it, so that's when I tried to install Reader 9. On the Vista computer I was having no trouble until I installed Reader 9 (in both cases I uninstalled the older version first).

Acrobat will not automatically open when you click on a PDF link in a website; in fact, with no Reader installed there isn't even a PDF file type recognized. I tried adding it and associating it with Acrobat, but it wouldn't let me do that. I have now solved my problem by installing Reader version 7, which seems to work fine.

I have recently installed Reader 9 and have encountered the same problem: PDFs do not open in browsers. I have Internet Explorer 8 beta 1 and Mozilla Firefox 2.0.0.15. No matter what websites the PDFs come from, they all open in the Reader 9 client.

I've also tried toggling the 'Display PDF in browser' checkbox in Edit > Preferences > Internet. It has had no effect. Previously in Reader 8.1.2, toggling this checkbox would prompt for a restart of the computer, but not in Reader 9.

Is there any solution other than reinstalling an older version of Reader?

I have been getting the "need Adobe reader 8 / 9 " message on my Vaio running Vista when trying to view web PDFs despite having installed 9 3 times.
If you save the PDF to desktop and then try, it opens fine.

On some PDFs the message says that I need to associate the file type with a program but it already is if you look at the association list.

Aandi, let me tell you what I know to be installed on my computer: Adobe Air, Adobe FlashPlayer ActiveX, Adobe Reader 9, and Adobe Shockwave Player 11. Flash videos from my browser will not play, even though I have installed the last version of Adobe Reader. What's the problem? Are any of my installed programs conflicting?

Hi, I have the same problem and could be solved by clicking on tools, internet options, advanced and ensure the option enable third party extensions under browsing.

However, I have a different problem. First, there is a windown that says that the document is being prepared. This window was not present in the earlier versions. Secondly, when I download several documents from the browser, it hangs and the internet browser closes by itself and reopens at the home page. Thirdly, when I tried to save the document, every time, it is the root directory that is being displayed. Previously, it was the last subdirectory. Any suggestions?

i have the same problem. I can clearly trace it to uninstalling adobe acrobat pro trial version that came iwth my sony. Now when i download reader 9, and foxit pdf readers, both don't work in webpages! i get that same error message. What can i do, reinstalling does nothing and i can find nothing in settings for either reader or explorer to fix it. The problem also persists in firefox.

I have tried all available options presented here in this Forum. The only option which is still succesfull is uninstalling the version 9 and instaling the latest Adobe Reader 8.1.2. After installing this, everything is back to normal and working fine.
So, it seems, I will wait for some fixes from Adobe with veriosn 9.

Yes, I know that, but if I need to open the pdf in a browser what to do then? This option doesn't help me a lot. Even, when yo uinstall reader 9, by default this checkmark "display pdf in browser" is unchecked! In earlier versions this was ok.
The specific program I'm working with needs to open pdf in a browser (not outside it), otherwise I'm loosing my program functionality. So, that is why i can't use Reader 9, which is really more faster then it's predecesor :)

We use to have the same issue with Windows XP SP3 (Fresh Install) & Adobe Acrobat Reader 9.0.0. I finally got it working again. For this I did some steps (one of these seems to have repaired the situation)

I am having the exact same problem with Acrobat Reader 9 and the latest version of Explorer. I keep getting a pop up box indicating I need to have the version 8 or 9 to open the pdf AND I HAVE 9 INSTALLED!!!!

I have tried to repair the installation. I have checked the internet security section of my control panel and it is configured correctly according to what is posted on the Adobe site.

What is going on here???????? AND WHY IS THIS PROBLEM OCCURING? I should of never updated as the old Acrobat reader worked fine but now it has been removed from my system with the 9 installation.

Any help would be greatly appreciated. I now can not access information I need in order to do business on a daily basis.

I have installed Reader 9, but getting this error when tried to open a PDF file from brower" This action is only valid for products that are currently installed" Please tell me how to fix this.
Thank you,
Chi

kellyanner,<br /><br />Please do not send people to other sites for reader. All versions of <br />Reader are available on either the Adobe web site or the Adobe ftp site. <br /> I believe, one needs permission from Adobe before posting installers <br />on other sites. When not downloading from Adobe, people cannot be sure <br />that the installer has not been tampered with. Why go elsewhere, when <br />you get it from the source. You can find all the different versions of <br />Reader for nearly every language supported:<br /><br />For early Acrobat Readers:<br /><br /><ftp://ftp.adobe.com/pub/adobe/acrobatreader><br /><br />For Adobe Readers:<br /><br /><ftp://ftp.adobe.com/pub/adobe/reader><br /><br />Mike

I followed the advice and removed Adobe 9 reader and found that I still had 8.1 on my computer as I had purchased 8.1 Standard with my Fujitsu scanner. The problem went away. Thanks for the feedback!!!

As soon as I updated to Adobe Reader Version 9, I started receiving the exact error message Mary Smith described: "The Adobe Acrobat/Reader that is running cannot be used to view PDF files in a web browser. Adobe Acrobat/Reader version 8 or 9 is required. Please exit and try again."

This condition disrupted my work with LiveCycle Designer on forms I had been creating. Every time I clicked on a PDF in LiveCycle, the error appeared and my LiveCycle Designer program would report it had to shut down.

Recommendation: until Adobe fixes this condition definitively, avoid Reader v9.0. From the posts here, this is clearly an issue not worth the hassles. It's probably easiest to just downgrade to v8.1.2 and get on with your work.

Disabling the "display in web browser" under Edit>Preferences>Internet in Reader 9 worked for me. However, I have Adobe Acrobat Pro 8 installed and the downloaded file opens in that program rather than in Reader 9.

I had installed Adobe Reader 9 a couple of days ago and opening PDFs in the browser window in IE 7 worked great.

Yesterday I installed an old version of Adobe Acrobat.

Today I tried viewing PDFs in the browser and got the same message:
"The Adobe Acrobat/Reader that is running cannot be used to view PDF files in a web browser. Adobe Acrobat/Reader version 8 or 9 is required. Please exit and try again."
When I clicked on OK a blank Acrobat window popped up and the browser showed "Page cannot be displayed."

This fixed the problem on my computer:
1. Control Panel -> Add Remove Programs -> Adobe Reader 9 -> Remove
2. Restarted the computer.
3. Tried opening a PDF in the browser window.
6. Clicked on Open on the Open / Save prompt.
7. Allowed Microsoft Search to look for an application.
8. In http://shell.windows.com/fileassoc/0409/xml/redir.asp?EXT=pdf clicked on the Adobe Reader link.
9. Followed instructions to install Adobe Reader 9 again.
10. Opened Adobe Reader and clicked on Accept on the licensing screen.
11. Restarted the computer.

I have Windows XP and after updating to Reader 9 I received the same message "The Adobe Acrobat/Reader that is running cannot be used to view PDF files in a web browser. Adobe Acrobat/Reader version 8 or 9 is required. Please exit and try again."

It is too bad Adobe doesn't simply tell you to register after installing Reader 9. I registered and now I can open pdf's. Thank you post #32 for the suggestion. It worked for me.

I am preparing to deploy to 3000 company PCs and this message: "The Adobe Acrobat/Reader that is running cannot be used to view PDF files in a web browser. Adobe Acrobat/Reader version 8 or 9 is required. Please exit and try again." is NOT going to work.

Unless of course you really need your PDF to open in your browser, then that solution is absolutely useless. Yeah, it may stop the error message, but your PDFs will open in Adobe Reader program instead of your browser. Some PDF forms and applications require IE's Active X or other browser based technology to fully function.

Some bug in the installation sometimes fails to include the path to the reader application in the Registry.

IF you need to open PDFs in your browser :

Got to Start - Run - enter "Regedit"
Browse to HKEY_Local_Machine \ Software \ Classes \ (you may have to create the following keys) Adobe \ Acrobat \ Exe \ : Change "Default" to "C:\Program Files\Adobe\Reader 9.0\Reader\AcroRd32.exe"
It should show up in regedit like ""C:\...""
This will fix the issue, by telling the browser where to find Adobe Reader.